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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fdb07b0b60b91b58406fa1e05d0a8a109d60662f8289ce6e6c8a7edc4ac0dab' 
  AND token = 'zZzwiG4lv8sBwfdFGHPWlVVV1lbwHmzCe56Vmfd+wKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}